To use. High Density is less permeable.

@GuppyGirl Oh once you start making seeds, you will have tons!!!

I’m pretty sure the light goes out when I close the fridge door, haven’t actually checked, but…

Nah, I just use whatever container they came in or had on hand. Old pill bottles, paper caches, those tiny little zip lock bags.

I keep mine in tupperware in the fridge. I’ve got seeds over 20 years old that still pop.

No, I think what @jmystro meant is that some issue in the root system caused that damage you see. Like a low pH situation caused the leaf tissue to not form properly and when pH came back into line normal growth resumed.